Hi
DNS SRV is a Load Balance system,
How it can be a fail over.
Only for call initialisation a UAC
will search for DNS SRV records, but after the the call starts, if
First server (From which call is beaing initiated) goes down then
thebye message will not go to second server
net4.in
Ritesh Jalan
Senior Engineer - Business Solution
Net4India Ltd.
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-----
Original Message -----
Sent:
Friday, July 07, 2006 2:00 PM
Subject:
Re: [Serusers] Global Failover Server
Following lines are an extract from the SIPit preliminary report
regarding supported DNS features in current implementations:
>160 people from 16 countries attended SIPit 18 with 73
different SIP implementations:
>Full 3263 25
>3263 (no naptr,SRV on) 13
>A only 22
>IP only (no DNS) 9
Which gives a percentage of 38/73 supporting SRV records, so more or
less half of the implementations supports this type of load balancing.
This value should be used with care because implementations include
both UAs and proxies/redirect/* servers.
I can also say that a higher percentage of desktop SIP phones supports
DNS SRVs, but since it's just my impression from the ones I have
touched I can not assure nor give a percentage...
Hope it helps,
Samuel.
2006/7/6, G.Jacobsen <
g_jacobsen@yahoo.co.uk >:
Samuel,
Do you happen to know what percentage of UAs out there
are really "Compliant" UAs ?
My
impression so far regarding SRV DNS records is that they are
theoretically a nice feature but unfortunately almost useless since one
needs to cater for those non-compliant UAs anyway. I would love to be
convinced of the contrary.
Can anyone
supply real usage figures regarding compliant/non-compliant UAS ?
TIA
Gerry
Look at RFC 3623.
Cofigure two SRV entries in
your DNS, one pointing to the UAS SERver and another to the UK server.
"Compliant" UAs will try to contact the other proxy upon failure of
their current one.
Samuel.
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